Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
  • H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
  • H02K7/075—Means for converting reciprocating motion into rotary motion or vice versa using crankshafts or eccentrics
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
  • A61M39/22—Valves or arrangement of valves
  • A61M39/28—Clamping means for squeezing flexible tubes, e.g. roller clamps
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
  • A61M39/22—Valves or arrangement of valves
  • A61M39/28—Clamping means for squeezing flexible tubes, e.g. roller clamps
  • A61M39/284—Lever clamps
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
  • A61M39/22—Valves or arrangement of valves
  • A61M39/28—Clamping means for squeezing flexible tubes, e.g. roller clamps
  • A61M39/288—Clamping means for squeezing flexible tubes, e.g. roller clamps by bending or twisting the tube
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K26/00—Machines adapted to function as torque motors, i.e. to exert a torque when stalled

Definitions

• the present invention relates to an actuator switchable between two positions.
• the invention also relates more specifically to a pipe clamp device, in particular for medical devices, incorporating a two-position actuator.
• a switchable actuator is used between two positions: open (un-pinched hose) and closed (pinched hose).
• hose clamp devices are for medical devices carrying blood when the device acts as an exogenous artificial heart, or for liquid or drug delivery applications.
• it must be possible to close the pipe in order to stop the circulation of liquid, whether in a predictable and controlled manner, or when the immediate stoppage of fluid circulation is necessary. This last case can arise when there is a bubble of air detected in the blood or other liquids administered in the body, these air bubbles representing a risk for the patient.
• the pipe clamp device must therefore be able to act very rapidly with great reliability.
• Hose clamp devices may also find uses in other areas where there is an advantage in cutting off the supply of a liquid in a hose without using a valve or valve installed in the liquid circuit.
• Hose clamp devices used in conventional medical devices include linear actuators with solenoids.
• One of the problems of these solenoids is that they must be powered in the open or closed positions. They therefore have poor performance and generate heat which requires, in some applications, to cool the device in which they are installed. Continuous power-up can also reduce the life and reliability of these components.
• the performance of these solenoids in terms of speed and pinch pressure is also not optimal.
• the advantage of two-position solenoid-based actuators is their low cost. However, there is an advantage in replacing these systems by less greedy and more efficient devices but which are also compact and economical.
• a general object of the invention is to provide a switchable actuator between two positions which is efficient, reliable and consumes little energy.
• a specific object of the invention is to provide an actuator for a pipe clamp device that is efficient, reliable and consumes little energy.
• an actuator comprising an electric motor with a rotary output axis and an output member switchable between two angular positions attached to the output axis.
• the actuator includes a latch mechanism including a spring and a non-rectilinear movable arm.
• the spring is fixed on the one hand to the movable arm and on the other hand to a fixed spring anchor on a fixed support.
• the movable arm is pivotably coupled to the support of the output member.
• the non-rectilinear shape of the movable arm is configured to allow the movable arm to partially surround the output shaft of the electric motor in one of said two positions.
• the rocking mechanism is mono-stable.
• the virtual line when the output member is pivoted from a first position to a second position, the virtual line moves from a position distant from the axis of rotation to a position close to the axis of rotation. rotation, the virtual line does not cross the axis of rotation.
• the flip-flop mechanism is bi-stable.
• the flip-flop mechanism is configured so that said virtual line, when the output member is pivoted from a first position to a second position, makes the virtual line pass from a position remote from the first position.
• axis of rotation at a position on the other side of the axis of rotation, the virtual line crossing the axis of rotation.
• the movable arm has a substantially curved shape and the movable spring anchor respectively the pivot are arranged substantially at opposite ends of the movable arm.
• the electric motor is a single-phase brushless torque motor.
• the output member is a clip member and includes a clip extension extending from a support and disposed at a non-zero distance from an axis of rotation of the output member.
• the output member drives a linear system.
• the output member may comprise a cam engaging a linear displacement member
• a gripper device comprising the actuator and a pipe support device comprising a pipe guide body with a support member, and a locking mechanism configured to hold a hose against the pressure element. 'support.
• a clip extension of the actuator output member is configured to clamp the closed pipe against the bearing member in the closed position.
• the device may further include a clip opening member coupled to the pivoting lever and configured to engage the output member when the lever is rotated from its locked position to its open position to tilt the output member from its position. closed to its open position.
• the gripper opening member may be configured to decouple from the output member so that the output member can move freely without driving said gripper opening member.
• the gripper opening member comprises one or more teeth configured to engage one or more teeth of the output member support.
• the output member comprises abutments cooperating with a stop on the pipe guide body to define the extreme positions of closure and opening.
• the device may comprise two actuators arranged so that their clamp extensions are arranged on the opposite side of a support element configured for the installation of two flexible hoses.
• the gripper opening member is integral with the pivoting lever.
• an absolute position sensor is integrated in the device, the position sensor configured to detect the position of the axis, support or clamp extension.
• the device comprises a local reserve of electrical energy for transforming a mechanically bistable system into a monostable system (failsafe) with virtually zero current consumption in both positions.
• the actuator of the hose clamp device is bistable. This makes it possible to guarantee the force or the torque in the two stable positions, without power consumption. The transition from one position to another is done in supplying the actuator for a short time.
• bistable actuator In a variant, it is possible to use magnetic forces, with a particular design of the main circuit or with the addition of an auxiliary magnet.
• a spring is used. In this latter variant, for rotary movements, the path of the tension spring virtually cuts the axis of rotation of the actuator motor. The spring is disposed at one of the two ends of the rotary output shaft.
• a proposed solution aims to integrate the necessary spring to the bistable function at any point of the device.
• a lever is integral in rotation with the axis in motion.
• On this lever is mounted a pivot for rotating a movable arm of rounded shape.
• One end of this movable arm is rotated around this pivot, the other end being fixed to the spring.
• the rounded shape of the movable arm makes it possible to pass around the axis and the traction spring can then produce a positive or negative torque depending on the position.
• the spring path no longer cuts the axis of the rotary device.
• the spring has two positions for which its length is minimal and the device is stable, separated by an unstable elongation zone that can be traversed either by the power supply of the actuator, or by an additional manual device.
• Figs. 1 is a perspective view of a switchable actuator between two positions according to one embodiment of the invention
• Fig. 2 is a perspective view of a pipe clamp device according to one embodiment of the invention
• Fig. 3a is a perspective view of a pipe clamp device according to a second embodiment of the invention
• Fig.3b is a perspective view of a pipe clamp device according to a third embodiment of the invention
• Figs. 4a and 4b are schematic views of a switchable actuator between two positions according to one embodiment of the invention illustrating the two stable positions of the actuator;
• Figs. 5a to 5d are schematic views of a switchable actuator between two positions according to one embodiment of the invention illustrating the displacement between two stable positions of the actuator;
• Figs. 6a to 6c are schematic views of a pipe clamp device according to another embodiment of the invention, illustrating the movement of a pipe guard of the actuator;
• Figs. 7 and 8 are schematic views of a hose clamp device according to embodiments of the invention with a linear output.
• a clamp device 4, 4 ', 4 "for opening and closing a pipe 2 by pinching the pipe is illustrated
• the clamp device comprises a pipe support device 6 and one or more actuators 8, the pipe support device 6 comprises a pipe guide body 1 8 and a locking mechanism 20, 20 '.
• the pipe guide body 18 comprises a support element 19 on which a section of the pipe 2 rests, the support element 19 forming a support against a pinching force pressing on this section of pipe 2 by an output member of the actuator 14.
• the locking mechanism 20 in this embodiment comprises at least one hook 21, preferably at least two hooks 21 arranged on either side of the 19 in the direction of extension of the hose 2.
• the bearing surfaces of the hooks 21 are opposed to the bearing surface of the bearing element 19.
• the hose 2 can be inserted into the hooks 21 by bending the pipe 2 around the support element 19 and by raising the two pipe portions 2 on either side of the support element 19 until these portions fit into the hooks 21.
• the spacing of the opening of the hooks 21 may be slightly smaller than the diameter of the pipe 2 intended to be installed, so that the pipe 2 is retained in the hook 21 by a slight pinch effect, the elasticity necessary for the insertion of the pipe 2 in the hook mainly from the flexibility of the pipe 2.
• the pipe support device 6 can be integrated in a medical device, in particular an external face of the medical device accessible by an operator of the device for installation pipe 2.
• the locking mechanism 20 'of the pipe 2 comprises a pivoting lever 22 allowing the positioning of the flexible pipe 2 on the support element 19 when the lever 22 is pivoted in its open position as shown in Figure 6a, and which can be pivoted into a closed position as shown in Figures 6b and 6c by locking the hose 2 on the support member 19.
• the pivoting lever 22 crosses the support element 19 blocking a lateral displacement of the flexible pipe 2.
• the pivoting lever 22 also comprises an inner shoulder (not shown) which abuts against the hose 2 in the opposite position to the support member 19 to lock the hose 2 against the bearing member 19.
• the pivot lever 22 is coupled to a gripper opening member 24 shown in Figures 5a to 5d.
• the actuator 8 comprises an electric motor 10 with a rotary output shaft 34, a flange 12, an output member 14, and a flip-flop mechanism 1 6.
• the electric motor is a rotary electric motor with a stator and a coupled rotor to the output shaft 34.
• the electric motor can be of different types, such as a brushless DC motor (brushless), a stepper motor, or other types of rotary electric motors known in itself.
• the electric motor is a single-phase brushless torque motor. This motor has the advantage of a residual torque, that is to say without current, low and a torque proportional to the supply current substantially constant over the entire race when the magnetic circuit is not saturated.
• the direction of the torque is a function of the supply polarity and these actuators may have a limited stroke (typically 75 to 80 °), which lends itself well to a switching application between two positions, for example for a hose clamp device.
• a position sensor (not shown) may be integrated into the actuator, for example a non-contacting magnetic sensor indicating a position or absolute value.
• the presence of an absolute position sensor provides high operational safety. This allows, in particular by setting the appropriate thresholds for the size and flexibility of the pipe, to detect the open and closed positions and, in the closed position, to detect whether there is a closed position without a pipe or a closed position with pipe.
• the position sensor can be used for closed-loop servocontrol, which makes it possible to optimize the power consumption, the travel time, the closing force or the noise of the device.
• the actuator or the control device may also comprise a local energy store, for example in the form of a battery or a capacitor, associated with a switching element making it possible to transform an actuator with two stable positions (bi-directional). stable) into a bi-stable actuator having a so-called failsafe security position.
• a local energy store for example in the form of a battery or a capacitor, associated with a switching element making it possible to transform an actuator with two stable positions (bi-directional). stable) into a bi-stable actuator having a so-called failsafe security position.
• a local energy store makes it possible to give an electrical pulse only to move from one position to another when there is a power failure so that the system finds a corresponding security position. at a known rest position and guaranteed in the absence of power supply.
• the flange 12 serves to secure the actuator 8 to a pipe guide support device and / or to a medical device, and optionally to provide a fastening element such as a fixed spring anchor 36.
• the fixed spring anchor 36 may however also be disposed on any other static support relative to the engine 10.
• the output member 14 comprises a support 38 fixed to the output shaft 34 of the electric motor.
• the support 38 may for example comprise a port 40 configured to fix the support on the output axis 34, for example by driving the support on the axis.
• many other fasteners between the output shaft and the support can of course be envisaged, the two parts can be welded together, glued, or part of an integrally formed part.
• the output member 14 further comprises a pivot 42 for a movable arm 48 of the rocker mechanism 16, for example in the form of an axis, disposed at a distance from the output shaft 34 and the support 38.
• the spindle may be attached to the support 38, or to a movable arm 48 of the latch mechanism.
• the output member 14 further comprises a clip extension 44 intended to abut against the flexible tube and to pinch it until it is closed, the clip extension 44 being arranged at a distance of the axis of rotation A of the support 38.
• the axis 34 or the support 38 may lead to a linear or pseudo-linear device serving as a clamp extension.
• the rotary-linear coupling can be done with a crank-handle mechanism, a lever, a radial or axial cam, or any other means known per se.
• Figure 7 illustrates a gripper device according to an embodiment of the invention wherein the output member 14 comprises a cam which performs rotational motion transformation in a linear motion on a gripper extension 37 along the axis of the motor .
• Figure 8 illustrates a gripper device according to an embodiment of the invention wherein the output member 14 comprises a cam which performs rotational motion transformation in a linear motion on a gripper extension 37 orthogonal to the axis of rotation. rotation of the motor.
• the rocker mechanism 16 comprises a non-rectilinear movable arm 48 and a spring 46.
• the movable arm 48 is pivotally coupled to the pivot 42 of the output member 14.
• the movable arm 48 comprises a movable spring anchor 50 and is also coupled to the spring 46.
• the spring 46 is fixed on the one hand to the movable spring anchor 50 disposed at one end of the movable arm 48 and secondly to the fixed spring anchor 36 on the flange 12 or to another fixed support relative to the electric motor 10.
• the spring 46 is configured to apply a tension force on the movable arm 48 at the point of the movable spring anchor 50 to the fixed spring anchor 36.
• the pivot 42 is on one side of said orthogonal virtual plane, remote from the fixed spring anchor 36, and the movable spring anchor 50 disposed on the movable arm 48 is on the other side of the orthogonal virtual plane on the same side as the fixed spring anchor 36.
• the non-rectilinear movable arm 48 may have, in one embodiment, a generally curved shape enabling the movable arm 48 to take a position partially bypassing the output axis 34.
• This allows a virtual line L formed between the pivot 42 and the fixed spring anchor 36 to be on one side of the axis of rotation A when the movable arm is in a first position, and when the movable arm is in a second position, to be d On another side of the axis of rotation A.
• the virtual line L formed between the pivot 42 and the spring anchor fixed 36 intersects the axis of rotation A.
• the force of tension applied by the spring 46 on the movable arm 48 thus generates in this embodiment two stable positions, the actuator is therefore bi-stable.
• the movable arm 48 may have a substantially curved shape and the pivot 42 and the movable spring anchor 50 respectively may be at opposite ends of the movable arm.
• the movable arm 48 may have other shapes and can support other components for example the movable arm can support an element of a position sensor cooperating with a position sensor element on the flange or on the motor (for example the output shaft or the support of the output member).
• the shape of the movable arm 48 In order to obtain bi-stable positions, the shape of the movable arm 48 must be non-rectilinearly configured so as to pass the virtual line L formed between the pivot 42 and the fixed spring anchor 36 on one side. the axis of rotation A to the other side namely that this line crosses the axis of rotation A when switching from one position to the other position.
• a mono-stable variant is also possible.
• the axis of rotation A is not crossed by the virtual line between the pivot 42 and the fixed spring anchor 36.
• the virtual line L can, in a second position, be aligned with the axis of rotation A or be very close to the axis of rotation relative to a first position, so that in case of current cutoff this second position is unstable and allows the actuator 8 to return to the first position due to the pulling force applied by the spring 46. Due to the tensile force applied by the spring 46 on the movable arm in the second position, corresponding to the open position of the clamp device 24, the torque to keep the actuator 8 in the open position is very low.
• the monostable variant can therefore be configured to be very economical in electrical energy when fluid flows in the pipe 2.
• the output member 14 returns to the first position, corresponding in this example to a position where the pipe 2 is closed.
• the return of the output member 14 can be performed only by the pulling force of the spring 46 in the case of a mono-stable variant, where appropriate a very weak pulse can be made when the virtual line L is located. on or very close to the axis of rotation A.
• a clamp device configured to clamp two pipes 2, for example this device being provided with two actuators 8 comprising two electric motors 10 mounted to a
• the support element 19 can be arranged between the clamp extensions 44 of two actuators, these clamp extensions therefore acting in opposite directions.
• the locking mechanism 20 comprises a pivoting lever 22 coupled to a gripper opening member 24.
• the gripper opening member 24 comprises a or several teeth 26a configured to engage teeth 26b extending from the output member 14 and in particular the support 38 of the output member 14.
• the pivot 30 around which the gripper opening member 24 pivots corresponds to the pivot of the pivoting lever 22.
• the gripper opening member 24 can be integrally formed with the lever, for example in the form of a plastic injected part, or comprise a separate part attached to the lever 22. The gripper opening member 24 thus pivots with the pivoting lever 22.
• FIG. 5a illustrates FIG.
• the pivoting lever 22 When a new pipe is placed in the clamp device, namely on the support member 19, the pivoting lever 22 can then be pivoted into the closed position in which the clamp extension 44 presses on the pipe and the closed. Upon tilting the pivoting lever 22 from the open position to the closed position, the teeth 26a of the gripper opening member 24 engage the teeth 26b of the output member 14 rotating it to the closed position until the teeth disengage as shown in Figure 5a.
• the disengagement point can be configured so that the movable arm 48 is always with the virtual line L between the pivot 42 and the fixed spring anchor 36 on the same side of the axis of rotation A as in the position closed so that the output member 14 back to the closed position as shown in Figures 5a and 5b.
• the disengagement of the clamp opening member allows, in operation (outside the loading / unloading phases using the lever), to move from one position to another, thanks to the motor, without moving the lever 22
• the pipe 2 remains well locked and there is no important mobile element user side. This reduces noise and risk, while increasing the life of moving parts.
• a spring or other suitable device keeps the gripper opening member disengaged.
• the gripper opening member 24 may also be coupled to a small electrical actuator (not shown) configured to control the rotation of the gripper opening member 24 between the open and closed positions to thereby operate the opening and / or closing of the lever 22 in a motorized manner.
• FIGS. 5a to 5d may correspond to a mono-stable variant, but also to a bi-stable variant.
• the output member 14, and in particular its support 38, can be provided with stops 33 cooperating with a stop 32 disposed on the guide body of the pipe 18, the stops and the stop defining the extreme angular positions of closing and opening clip.

Landscapes

• Health & Medical Sciences (AREA)
• Heart & Thoracic Surgery (AREA)
• Engineering & Computer Science (AREA)
• Hematology (AREA)
• Anesthesiology (AREA)
• Biomedical Technology (AREA)
• Pulmonology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Power Engineering (AREA)
• Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=50732807

Family Applications (1)

Country Status (2)

Cited By (8)

Families Citing this family (1)

Citations (2)

• 2014
  • 2014-05-12 EP EP14167987.8A patent/EP2945264B1/de active Active
• 2015
  • 2015-05-01 WO PCT/EP2015/059632 patent/WO2015173037A1/fr active Application Filing

Patent Citations (2)

Also Published As

Similar Documents

Legal Events